Bonn vs urban center

Bonn and urban center both are nouns.

Word	Noun	Adjective	Verb	Adverb
Bonn	Yes	No	No	No
urban center	Yes	No	No	No

Bonn (noun)	urban center (noun)
a city in western Germany on the Rhine River; was the capital of West Germany between 1949 and 1989	a large and densely populated urban area; may include several independent administrative districts